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Updated: May 10, 2026
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High-throughput Identification of Bacteria Repellent Polymers for Medical Devices
Published on: November 5, 2016
Antibacterial Biomimetic Hybrid Films
M Carme Coll Ferrer1, Noreen J Hickok, David M Eckmann
1The Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, PA 19104, US ; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, US.
Soft Matter
|June 29, 2013
Summary
This study introduces a novel hybrid coating with silver nanoparticles (Ag NPs) embedded in dextran. The coating effectively reduces bacterial adhesion, showing promise for biomedical applications like implants and catheters.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Surface Chemistry
Background:
- Developing advanced antimicrobial coatings is crucial for preventing infections in biomedical devices.
- Silver nanoparticles (Ag NPs) are known for their antimicrobial properties, but their stable integration into biocompatible materials requires innovative methods.
Purpose of the Study:
- To develop a novel hybrid coating by grafting dextran to a surface and embedding silver nanoparticles (Ag NPs).
- To investigate the effect of Ag NP concentration on coating properties and antimicrobial activity.
- To explore potential biomedical applications for these antibacterial hybrid coatings.
Main Methods:
- Synthesizing Ag NPs *in situ* in the presence of oxidized dextran.
- Grafting oxidized dextran to an amine-functionalized surface, simultaneously trapping Ag NPs.
- Controlling Ag NP loading using different silver nitrate concentrations (2 mM and 5 mM).
- Characterizing coating thickness, surface features, and Ag NP distribution using AFM and UVO studies.
Main Results:
- Hybrid coatings (DEX-Ag2 and DEX-Ag5) were successfully prepared with varying film thicknesses (7 nm and 12 nm, respectively).
- Ag NPs (~5 nm) and their aggregates were observed embedded within the dextran matrix.
- The DEX-Ag2 coating demonstrated superior resistance to bacterial adhesion compared to DEX-Ag5, dextran, and silicon.
- Coating properties, including thickness and Ag NP aggregation, were influenced by silver nitrate concentration.
Conclusions:
- A novel method for creating dextran-based hybrid coatings with embedded Ag NPs was established.
- The developed coatings exhibit significant antimicrobial activity, with lower Ag NP concentrations showing better performance in resisting bacterial adhesion.
- These antibacterial hybrid coatings offer versatile biomedical applications, including surface modification for implants and catheters.
